On Tue, May 29, 2007 at 01:56:24PM -0700, Linus Torvalds wrote:
>
>
> On Mon, 28 May 2007, Srivatsa Vaddagiri wrote:
> >
> > So is it settled now on what approach we are going to follow (freezer
> > vs lock based) for cpu hotplug? I thought that Linus was not favouring
> > freezer
> > base
On Wed, May 30, 2007 at 10:03:01AM -0700, Linus Torvalds wrote:
> > and that's where all the problems started - sleepers needing to take that
> > mutex
> > recursively (which we did/do not support).
> >
> > foo() takes cpu_bitmask_lock and calls
> > foo_bar() which also needs cpu_bitma
On Wed, 30 May 2007, Srivatsa Vaddagiri wrote:
>
> and that's where all the problems started - sleepers needing to take that
> mutex
> recursively (which we did/do not support).
>
> foo() takes cpu_bitmask_lock and calls
> foo_bar() which also needs cpu_bitmask_lock
>
> What is
On Tue, May 29, 2007 at 01:56:24PM -0700, Linus Torvalds wrote:
> As far as I'm concerned, we should
> - use "preempt_disable()" to protect against CPU's coming and going
> - use "stop_machine()" or similar that already honors preemption, and
>which I trust a whole lot more than freezer.
>
On Tue, 2007-05-29 at 13:56 -0700, Linus Torvalds wrote:
>
> On Mon, 28 May 2007, Srivatsa Vaddagiri wrote:
> >
> > So is it settled now on what approach we are going to follow (freezer
> > vs lock based) for cpu hotplug? I thought that Linus was not favouring
> > freezer
> > based approach
On Mon, 28 May 2007, Srivatsa Vaddagiri wrote:
>
> So is it settled now on what approach we are going to follow (freezer
> vs lock based) for cpu hotplug? I thought that Linus was not favouring
> freezer
> based approach sometime back ..
As far as I'm concerned, we should
- use "preemp
On Mon, May 28, 2007 at 10:54:43AM +0900, Satoru Takeuchi wrote:
> Since I'm investigating this problem now, I'm glad if someone
> reports the test result on other arch or freezer.
I suspect the freezer based approach will not have this problem. Gautham
could probably verify that.
Andrew/Linus,
Hi,
I found a bug on CPU hotplug. If `pfmon --system-wide' is running,
CPU hot remove causes system hang. On the other hand, CPU hot add
during that command seems to work fine.
I detected this problem on my ia64 box, and I don't know that this
problem is also occur on any arch or freezer based CP
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